An Optical Transport Network (OTN) is a standardized framework, defined by ITU-T G.709, for carrying client signals over wavelength-division-multiplexed optical fiber with framing, error correction, and management overhead. It provides high-capacity, long-haul transport with operations and maintenance features that legacy SONET/SDH lacked. OTN forms a core layer of carrier and backbone networks beneath higher-layer packet and service traffic.
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- OTN wraps client traffic in standardized frames that add monitoring and error correction for long-haul, high-capacity transport. It underpins carrier backbones, multiplexing many wavelengths onto a single fiber while exposing operations and maintenance capabilities absent from earlier transport technologies.